#include<bits/stdc++.h>
using namespace std;
int n,l,r;
int main()
{
	freopen("candy.in","r",stdin);
	freopen("candy.out","w",stdout);
	scanf("%d%d%d",&n,&l,&r);
	if(l/n!=r/n)printf("%d",n-1);
	else printf("%d",r%n);
	return 0;
}
